Cognitive control affects motor learning through local variations in GABA within the primary motor cortex.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• The primary motor cortex (M1) is vital for motor learning, but its network interactions during this process are not fully understood.
• The fronto-parietal execution network (FPN) is hypothesized to supply crucial learning information for cognitive control during practice.

Purpose of the Study:

• To investigate network-level brain changes during sequential finger tapping learning under speed pressure.
• To explore the relationship between M1's neurochemical environment and its functional connectivity with the FPN during motor learning.

Main Methods:

• Combined magnetic resonance spectroscopy (MRS) with task and resting-state functional magnetic resonance imaging (fMRI).
• Assessed network activity and functional connectivity in participants learning a sequential finger tapping task.

Main Results:

• Motor learning increased preparatory activity in fronto-parietal regions, overlapping the FPN and sensorimotor network (SMN).
• Increased M1-FPN connectivity correlated with reduced GABA/glutamate ratio in M1, particularly in the parietal region.
• Reduced GABA/glutamate ratio in M1 positively correlated with task performance improvements.

Conclusions:

• Motor learning driven by cognitive control involves localized changes in M1's GABA/glutamate ratio.
• These M1 neurochemical changes reflect remote connectivity with the FPN, indicating network-level motor sequence learning formation.